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Study on the cocolouration effect in the β‐complex formation reactions of rare earths with p ‐chloro‐chlorophosphonazo (CPApC)
Author(s) -
Xu ZhongJun,
Hsu ChungGin,
Zhang Lan,
Pan JiaoMai
Publication year - 1992
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19920100507
Subject(s) - terbium , chemistry , ionic radius , molar absorptivity , yttrium , cerium , rare earth , inorganic chemistry , ionic bonding , lanthanum , europium , ion , nuclear chemistry , mineralogy , organic chemistry , oxide , physics , optics
Terbium‐ and yttrium‐group rare earths form β‐complexes with CPApC in acidic medium. The sensitivities for determination of these rare earths by this reaction depend on their ionic radii. Cerium‐ or terbium‐group rare earth in the presence of yttrium‐group element produces the cocolouration effect which remarkably sensitizes the reaction. Yb‐CPApC‐Eu complex has a molar composition of 1:4:2 and gives a molar absorptivity of 2.02×10 3 L·mol −1 ·cm −1 at 746 nm for Eu. It is found that the closer the lengths of ionic radii of the rare earths are, the greater will be the cocolouration effect.